Saw-mill set-works



(No Model.) 3 SheetsSheet :2.

T. S. WI'LKIN.

SAW MILL s31: WORKS. N0. 292,271. Pa,tent' ed J zz; 1884.-

WITNESSES w w S 4' Attorneys.

SAW MiLL SET WORKS.

- 110,292,271. Pat nted Jan. 22, 1884-.

Jul/E 09:

WITNESSES .06,

' PATENT FFl CE,

THEODORE S, WILKIN, OF MILWAUKEE, WISCONSIN.

SAW-MILL SET-weeks.

SPECIFICATION forming part of Letters Patent No. 292,271, dated January22, 1884. r Application filed November 16,1883. (No model.)

icy aZZ whom/it may concern:

Be 1t known that'l, THEODORE S. WILKIN,

of Milwaukee, in the county of Milwaukee and State oflVis'consin, haveinvented certain Improvements in Saw-Mill Set-WVo-rks, of whichthefollowihg is a specification.

My invention relatesto saw-millset-works,

and particularly to the ratchet mechanism employed for advancing theknees'on the head blocks, and to the brake.

features and detailsphereinafter' fully ex plained.

In mechanism of this character it has hitherto been'customary to employaratchet-wheel having teeth on its circumference, and to provide a,series of dogs or pawls, each a little longer than the next, to insure aprompt en'- gagement when the op crating-lever was moved Under suchconstruction only one pawl could be in engagement with the ratchet-teethat any time, and notwithstanding the number of pawls used, and theconsequently short movement required to cause one of the series toengage with a tooth of the ratchet, that movement was sufficient,especially after use andeonsequent wear of the mechanism, to permit vthepawl'or dog to strike with some force against the tooth. This actionrepeated constantly cuts out the teeth with great rapidity, the

pawls being of tempered steel and acting in much the same manner ascold-Qchisels. This cutting out of the teeth is avery serious trouble,interfering .with the efficient operation of thep'arts and necessitatingfrequent repair or renewal of the'ratchet, and of course involving versesection through the same; 4, a perspective view of the ratchetmechanism.

A indicates the carriage as a whole; B, the

head-blocks; O, the knees, and D the ratchetwheel, which is, as usual,mounted upon a horizontalshaft, E, which carries the pinions for movingthe knees G. It'is to this ratchetwheel and the parts operating thereonthat this invention mainly relates.

* The side faces of the wheel D are formed with radial ratchet-teeth a,extending from the I circumference or outer edge inward, in practiceabout'threeinches, the wheel being about eighteen to twenty inches indiameter ordinarily, though of course the size and proportions maybevaried to any desired extent.

The wheel D is rigidly secured upon shaft E,

ing faces of the teeth of thewheel, as will be readily understood uponreferring to the drawings. The ratchet-wheel D is made to turn in thedirection indicated by arrow, and treating that as the forwarddirection, the rear faces of theteeth a are perpendicular to the sidefaces of the wheel, while the forward faces of the teeth d are thusperpendicular to the side faces of the disks 1*. The disks F are eachpressed toward and held in contact with wheel D by a spiral spring, G,bearing at one end against the face of the disk, coiled;about the hub 0thereof, and bearing at its outer end against a collar, H, securedrigidly upon the shaft B. Each disk is thus made to lock with theratchet-whee the teeth of one engaging with the teeth of he other, butthe elasticity of the springs G allowing the beveled faces of the teethto ride over each other when the disks are-rotated backward. In this waythe disks are caused to impart motion to the ratchetwheel when turnedforward, but have no effeet thereon when moved backward. In order tomake the rotation of the wheel continuous, I employ the double-actionarrangement common to such machinerythat is to say, the two disks arerespectively connected by links of to arms 9 71, extending radially inopposite directions from a rock-shaft, I, provided with a hand-lever Jas shown in Figs. 2 and 4, so that upon moving the hand-lever in eitherdirection one of the disks F is turned forward and the other is at thesame time turned backward, the forwardly-moving disk engaging with theratchet-wheel and causing it also to rotate in a forward direction, andthe other disk moving backward to take a new hold pre paratory to itsforward rotation and movement of the disk. Thus bysimply moving thehand-lever J back and forth a continuous rotary movementin one directionis imparted to the wheel D. hen it is desired to withdraw or run theknees back upon the head-block, it is necessary to disconnect the disksfrom the ratchet-wheel D, and for this purpose two links, K, areemployed, each formed with an elongated eye, 2', to pass around theshaft E and permit the links to move endwise, the inner ends of thelinks being formed with beveled or inclined faces j, which ride upon theinclined faces of the hub b of the ratchetwheel D, thereby forcingoutward the links K, and with them the disks F, which latter are pressedagainst the links by the springs G. \Vhen the links are drawn outward ordownward, when arranged as shown in the drawings, the disksare forcedaway from the ratchet-wheel and out of engagement therewith, as will bereadily understood, leaving the wheel and its shaft free to rotatebackward. By again moving the links inward their wedgeshaped or beveledends are caused to ride off the ends or faces of hub I), and the disksare again permitted to come into engagement with the wheel D. The linksK are connected by pivots to elbow-levers M, which are bolted or madefast to a common handle or lever, N, Figs. 1 and I.

In order to make room for the links, the disks are preferably cut awaythrough a part of their circumference slightly exceeding their rotarymovement; but, if desired, the circumference may be left unbroken andthe links bent outward through slots or openings made through the facesof the disks, concentric with shaft 11 and of such width in a radialdirection to permit the necessary play in forcing the disks outward orpermitting them to return.

In machinery of this description it is customary to provide the shaft Ewith a brake-wheel, to receive a brake or friction band, which isapplied mainly to retard or stop the backward motion of the knees, butis also serviceable in controlling the apparatus generally. A specialbrake-wheel has always been provided heretofore; but under myconstruction I am enabled .to dispense with such special wheel and toap- 1, 2, 3, and 4. The arrangement of this brakeband will remain in allrespects unchanged, except that, as above mentioned, it is applieddirectly to the ratchet-wheel, instead of to a special brake-wheel, oneend being made fast to the carriage-frame or other suitable body and theother end connected with an operating-lever, 0. By this arrangement I amenabled to save a considerable amount of room on the carriage and tobring the brake-lever within easy reach of the attendant operating theratchet mechanism, besides effecting some saving in cost ofconstruction.

The apparatus, constructed as herein described and shown, is free fromthe difficulties and objections mentioned as incident to the ordinaryconstruction, the entire series of teeth in one or the other diskengaging simultaneously with those of the ratchet-wheel, andconsequently distributing the concussive force incident to theengagement of the teeth over the whole series of teeth, instead ofthrowing it entirely upon a single tooth. The same principle ofconstruction may in some cases be applied to single-acting ratchetmechanism by omitting one disk and its attendant parts.

It is obvious that the means for oscillating the disk or disks may bemodified, and that, if desired, the operating levers or handles may beapplied directly thereto, the only essential requisite being that somemeans be supplied for oscillating the disks.

It is also obvious that instead of an encircling brake-band a brake-shoemay be applied to the circumference of wheel D.

Ratchet-teeth have before been made upon the side face of a wheel, andsingle-toothed pawls have been combined therewith to give motion to thewheel, such construction having been adopted for the purpose ofpermitting gear-teeth to be used on the periphery of the wheel.

I do not claim, broadly, a wheel having ratchet-teeth on its side faceor faces, and a single-tooth pawl or pawls arranged to engage therewith,such construction being open to the same objections as to wear that Ihave set forth in regard to wheels having the peripheral ratchet-teeth.

Having thus described myinvention, whatI claim is 1. In a ratchetmechanism for producing rotary motion, the combination of a wheel havingratchet-teeth on its side face, and an oscillatory disk adapted to bemoved to and from said side face, and provided with a series ofratchet-teeth to engage with those of the wheel.

2. In aratchet mechanism for imparting romoved in a forward direction,and the disk is permitted to disengage itself from andm'ove backindependently of the wheel when operated in a backward direction. 1

3, In a ratchet mechanism for imparting r0; tary motion, th'ecombinationof a wheelhaving ratchet-teeth on its side face, a disk adapted andarranged to move to and from said face, and provided with similar teeth,a spring bearing against the disk andserving to urge it into contactwith the ratchet-wheel, and a beveled or wedge-shaped bar, arranged,substantially as shown, to enterbetween the disk and wheel to separatetheir faces. 7

4. The herein-described ratchet mechanism for producing rotary motion,consisting of wheel D, having ratchet-teeth on its side faces, disksF'F, likewise provided with teeth on their inner faces, springs G,rock-shaft I, having arms g h, and links 6 f, connecting the disks withsaid arms, substantially as shown and described.

5. In combination with shaft E, ratchetwheel D, having teeth on its sidefaces, disks F F, mounted loosely upon said shaft and furnished withteeth to engage with those of the ratchet-wheel, means, substantiallysuch as shown and described, for simultaneously moving the disks inreverse directions, springs G, bearing against the disks and serving topress them toward the wheel D, links K, having elongated openings i andbeveled faces j, and encircling the shaft E between the wheel D anddisks F, and a hand-lever, N, connected with the links, substantially asset forth.

6. The combination,substantially as shown and described, of shaft E,ratchet-whecl D, secured rigidly upon said shaft, ratchet-disk F,mounted loosely upon the shaft, a hand-lever connected with said disk,collarH, and spring G, bearing at one end against the disk and at theother end against the collar, as and for the purpose explained.

7. The combination, substantially as set forth, of shaft E,ratchet-wheel D, firmly secured thereon, and provided with a hub havinga beveled end face, ratchet-disk F, spring G, serving to press the diskagainst the wheel, and slotted link K, having beveled face j, arranged,substantially as shown, to ride upon the beveled end of the hub of thewheel and .to separate the disk and wheel.

'8. In combination with ratchet wheel D, having teeth on its side face,and with link or bar K, having beveled face j, arranged, substantiallyas shown, to bear against the hub of the ratchet-wheel, disk F, providedwith teeth to engage with those of the wheel, and cut away,substantially as described and shown, to give room for the link or barK.

' 9. In combination with a ratchet-wheel having teeth on its side face,and an oscillatory toothed disk adapted to impart rotary motion to saidwheel, abrake-band applied to the circumference of the wheel andprovided with an operating-lever, substantially as shown and described.

10. In combination with shaft E and ratchet wheel D, s'ecure'd thereon,disks F F, springs G G, and collars H, rockshaft I, provided with arms 9h,'and hand-lever J links 0 f, connecting the arms 9 h with the disks,brake-band L, and brake-lever 0, all substantially as shown.

THEODORE S. WILKIN.

'Witnesses:

WM. WrALLIS, THEODORE F. WAMBOLID.

